JPH0660068U - PCB connector - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the occurrence of cracks at the joints of terminals due to expansion and contraction of printed circuit board connectors due to temperature changes. [Structure] In order to prevent unreasonable force from being generated in the portion where the lead pieces 5 of the terminals, which are attached to the insulating housing 1 at a predetermined pitch in plural sets, are soldered to the printed circuit board 3, a spring portion is formed on the lead pieces 5. 5a is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a printed circuit board connector for connecting a cord or the like to the printed circuit board.

[0002]

[Prior art]

 A printed circuit board connector is generally made of a material having a high heat resistance and a small coefficient of thermal expansion as a housing material of the connector, and is fixed to the printed circuit board with screws or the like. In this connector, the insulating housing and the lead wires that are individually attached to the housing at a specified pitch are soldered to the pads or through holes of the printed circuit board by a method such as reflow soldering or flow soldering to form the pattern on the printed circuit board. Is conducted.

Such a conventional connector is shown in FIGS. 5 and 6. 1 is a housing, 2 is a terminal, 2a is a contact part, 3 is a printed circuit board, 4 is a screw, 5 is a lead piece, 6 is a solder joint part, 7 is a pad, 8 is a through hole, 9 is a land, and X is a crack. is there. 6A shows a method in which the lead piece 5 of the terminal is solder-bonded to the printed circuit board, and FIG. 6B shows a method in which the lead piece 5 penetrates the board and is solder-bonded.

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional printed circuit board, since the thermal expansion coefficients of the housing 1 and the printed circuit board 3 are different, when used in a place where temperature changes are large, such as in an automobile, the thermal expansion amount a of the housing and the thermal expansion amount of the printed circuit board are large. The relation of b is a> b.

Therefore, when the above temperature change is repeated many times, stress is applied to the solder joint portion 6, cracks X occur in the solder joint portion 6 as shown in FIG. 6, and finally the conduction of the lead piece 5 is cut off. There is also a problem that some of them are released.

[0006] In consideration of the above problems of the conventional printed circuit board connector, the present invention attaches the spring structure to the lead piece so that the spring absorbs the thermal stress applied to the solder joint even if the temperature changes. It is an object of the present invention to provide a reliable connector for a printed circuit board by preventing unreasonable force from acting on the solder joint portion of the terminal.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention provides a plurality of sets of terminals having lead pieces on one side wall of an insulating housing at a predetermined pitch, and the lead pieces connected to the circuit pattern of the printed circuit board have sufficient elasticity to absorb thermal stress. The printed circuit board connector is formed by forming parts.

[0008]

[Action]

 The connector of the present invention having the above-mentioned structure is fixed to a printed board by a method such as screwing, and each terminal is soldered and fixed to the board, and a connecting connector is connected to the terminal for use.

Even if the housing expands or contracts due to a temperature change, its movement is absorbed by the elastic portion formed on the lead piece of the terminal, and therefore, no unreasonable force acts on the joint portion fixing the lead piece. Therefore, cracks are prevented from being generated at the joint.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show the outline of the configuration of the printed circuit board connector of the embodiment. Similar to the conventional example, the basic configuration is such that one side wall of the insulating housing 1 having a housing 1a for housing a connector is provided with a plurality of sets of terminals 2 at a predetermined pitch. The terminal 2 has a contact portion 2a and is fixed to the housing 1 by a method such as press fitting or insert molding.

The housing 1 is fixed to the printed circuit board 3 with screws 4. The lead piece 5 of the terminal 2 is joined to the printed circuit board 3 by two methods as shown in FIGS. 2 (a) and 2 (b). In (a), the lead piece 5 is fixed to the pad 7 by reflow soldering at the solder joint portion 6. In (b), the lead piece 5 is inserted into the through hole 8 and fixed by the solder joint portion 6.

This embodiment is different in that the lead piece 5 of the terminal 2 is provided with a spring portion 5a as shown in the figure. The spring portion 5a may be a coil spring as shown in FIG. 4 (a), but as shown in FIG. 4 (b), the lead piece 5 may be corrugated to have elasticity.

The connector of the embodiment configured as described above is fixed to a printed board, and a connecting connector is connected to the printed board for use. Even when this connector is used in an environment where the temperature conditions change drastically, such as in automobiles, and vibration is severely applied, cracks will not occur in the parts where the lead pieces of the terminals are fixed. .

[0014]

【effect】

 As described in detail above, in the connector of the present invention, the lead piece of the terminal provided on the side wall of the housing fixed to the printed circuit board is provided with the elastic portion, so that the mismatch between the printed circuit board and the housing due to the thermal expansion occurs. Even if stress is not applied to the solder joint, the reliability of the solder joint with respect to changes in the environment (temperature) can be significantly improved, and it is effective when used in fields where printed circuit boards such as automobiles, electronics, and consumer products are used. Target.

[Brief description of drawings]

FIG. 1 is a side view of a printed circuit board connector according to an embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an external perspective view of the same as above.

FIG. 4 is an enlarged detailed view of a spring portion.

FIG. 5 is a side view of a conventional printed circuit board connector.

6 is a sectional view taken along the line VI-VI in FIG.

[Explanation of symbols]

 1 Housing 2 Terminal 3 Printed Circuit Board 5 Lead Piece 5a Spring Part 6 Solder Joint 7 Pad 8 Through Hole

Claims (1)

[Scope of utility model registration request] 1. A printed circuit board connector comprising a plurality of sets of terminals having lead pieces on one side wall of an insulating housing at a predetermined pitch, and elastic parts formed on the lead pieces connected to a circuit pattern of the printed board.